from django.shortcuts import render, redirect
from .models import Topic, Entry
from .forms import TopicForm, EntryForm
from django.contrib.auth.decorators import login_required
from django.http import Http404, HttpResponse,  HttpResponseRedirect
from . import models

# Create your views here.
def index(request):
    """学习笔记的主页"""
    return render(request, 'learning_logs/index.html')

@login_required
def topics(request):
    """显示所有的主题"""
    topics = Topic.objects.order_by('date_added')
    # topics = Topic.objects.filter(owner=request.user).order_by('date_added')

    context = {'topics': topics}
    return render(request, "learning_logs/topics.html", context)

@login_required
def topic(request,topic_id):
    """显示单个主题及其所有的条目"""
    topic = Topic.objects.get(id=topic_id)
    # #确认请求的主题属于当前用户，配合topic归属User
    # if topic.owner != request.user:
    #     raise Http404
    # check_topic_owner(request,topic)

    entries = topic.entry_set.order_by('-date_added')
    context = {'topic': topic, 'entries': entries}
    return render(request, 'learning_logs/topic.html', context)

@login_required
def new_topic(request):
    """添加新主题"""
    if request.method != 'POST':
        #未提交数据，创建一个新表单
        form = TopicForm()
    else:
        #POST提交的数据，对数据进行处理
        form = TopicForm(data=request.POST)
        if form.is_valid():

            # 确认请求的主题属于当前用户，配合topic归属User
            new_topic = form.save(commit=False)
            new_topic.owner = request.user
            new_topic.save()

            form.save()
            return redirect('learning_logs:topics')

    #显示空表单或指出表单数据无效
    context = {'form': form}
    return render(request,'learning_logs/new_topic.html', context)

@login_required
def new_entry(request, topic_id):
    """在特定的主题中添加新条目"""
    topic = Topic.objects.get(id=topic_id)

    if request.method != 'POST':
        #未提交数据，创建一个空表单
        form = EntryForm()
    else:
        #POST提交数据，对数据进行处理
        form = EntryForm(data=request.POST)
        if form.is_valid():
            new_entry = form.save(commit=False)
            new_entry.topic = topic
            new_entry.save()
            return redirect('learning_logs:topic', topic_id=topic_id)

    #显示空表单，或指出表单数据无效
    context = {'topic': topic, 'form': form}
    return render(request, 'learning_logs/new_entry.html', context)

@login_required
def edit_entry(request, entry_id):
    """编辑既有条目"""
    entry = Entry.objects.get(id=entry_id)
    topic = entry.topic

    # # 确认请求的主题属于当前用户，配合topic归属User
    # if topic.owner != request.user:
    #     raise Http404
    check_topic_owner(request, topic)

    if request.method != 'POST':
        #初次请求，使用当前条目填充表单
        form = EntryForm(instance=entry)
    else:
        #POST提交数据，对数据进行处理
        form = EntryForm(instance=entry, data=request.POST)
        if form.is_valid():
            form.save()
            return redirect('learning_logs:topic', topic_id=topic.id)

    context = {'entry': entry, 'topic': topic, 'form': form}
    return render(request, 'learning_logs/edit_entry.html', context)

# def del_entry(request, entry_id):
#     """在条目下添加一个删除条目的选项"""
#     topic_id = Entry.objects.get(id=topic_id)
#
#     print(request.user, topic_id)
    # delete_id = Entry.objects.get(id=entry_id)
    # id = request.GET.get('id')
    # entries.delete()
    # Entry.objects.filter(id=id).delete()
    # check_topic_owner(request, topic)
    # if request.POST.has_key('delete'):

        # entry_id = Entry.objects.get(id=entry_id)
    # delete_id = request.GET.get("delete_id")
    #     entry.delete()

    # return HttpResponseRedirect({request.user})


def check_topic_owner(request,topic):
    # 确认请求的主题属于当前用户，配合topic归属User
    if topic.owner != request.user:
        raise Http404